Customer Provided Routers - Samsung Officeserv 7100 Technical Manual

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OfficeServ 7100 SPECIAL APPLICATIONS
TECHNICAL MANUAL PART 2 JANUARY 2009
In the OfficeServ 7100 "public" and "private" do not necessarily actually mean public
and private. These are relational terms to determine if the MP10/MP10a must look at
source IP addresses and convert to a destination address. This is done when there are
two different networks. As an example, if all the IP addresses are exposed to the
"public" unprotected Internet network. The programming for the MP10/MP10a, MGI,
and ITP keyphones would be programmed as private. They are all on the same
network.
If the MP10/MP10a, MGI and several ITP keyphones were on a LAN based "private",
protected network, behind a router and the Internet IP address was in front of the router
and "exposed" to the public Internet the programming for the MP10/MP10a, MGI and
local ITP keyphones would be private. In this case the MP10/MP10a, MGI and remote
ITP keyphone would also have public IP entries to show the external Internet addresses
for translation to the internal Intranet. This external public entry address allows the
MP10/MP10a to convert the external IP address to the internal private addresses.

Customer Provided Routers

Exposure of the private network to the public can compromise the security of the
private network. To use the Private with Public relationship the networks are usually
separated by a router and/or firewall. The routers used MUST be able to support
"reservations" or "port forwarding" feature. The Reservations feature in routers allows
the router to "reserve" an internal IP address to be permanently connected or
forwarded to an external IP address. This permits packets sent to and from the external
IP address to be sent to the internal IP address. Different router manufacturer's support
varying numbers of reservations or port forwarding. Without this feature in the
customer supplied router the OfficeServ 7100 Private with Public IP addressing will not
function and all address must then be exposed to the public network. A router
supporting this feature permits the iDCS VoIP features while also allowing the customer
to access the public Internet from their LAN based PC's (separate IP address required).
In most applications the equipment supporting reservations would be located at the
OfficeServ 7100 system side. The remote location can have a either a public static IP
address for each ITP keyphone, a NAT supporting router with a single public IP
address with multiple ITP keyphones.
2.6.17